How can I run the same tests twice (or more) but with one thing different

[fregante]

Let's say I have this

const identity1 = x => x;
const identity2 = y => y; // unused

test('base', t => {
  test.is(identity1(555), 555)
});

I want to run this test a second time, but replacing part of it (identity1 -> identity2).

Is there any trick other than these 2 options?

• run ava twice: ava && ID=2 ava

• explicit loop:

   const identity1 = x => x;
   const identity2 = y => y;
  
   for (const id of [identity1, identity2]) {
   	test('base ' + id.name, t => {
   		test.is(id(555), 555)
   	});
   }

In this specific situation, I want to ensure that two implementations are identical, but I suppose it can be applied to anything else (testing multiple websites, multiple sources, etc)

[novemberborn]

I would use a macro:

const checkIdentity = (t, fn) => {
  t.is(fn(555), 555)
}

checkIdentity.title = (title, fn) => `${title || ''} ${fn.name}`

test('base', checkIdentity, identity1)
test('base', checkIdentity, identity2)